Magnetism
True or False: All magnets have the same shape and size.
False
direction of magnetic field
North to South
True or False: Like charges attract and unlike charges repel.
False. Like charges repel and unlike charges attract.
the area of a magnet that has the strongest force?
the poles
True or False: An electromagnet is a permanent magnet.
False. An electromagnet can be turned on or off. Once the circuit is broken, the magnetism is lost.
True or False: All magnets have a north and south pole.
True
one of the two opposite ends of a magnet
pole
What is the world's largest magnet?
the Earth. Its magnetic fields help keep solar flares from hitting the earth.
True or False: An electric crane is an example of an electromagnet.
True
What would happen if the north ends of two magnets were close together?
Repel
A tool used to establish directions using a magnet.
compass
Name 3 metals are ferromagnetic
Iron, nickel, cobalt
True or False: A refrigerator magnet is a permanent magnet.
True.
Even when you take it off the refrigerator, it is still magnetic.
If a south end of a magnet is close to a north end of a magnet, the magnets will _________.
Attract
any material capable of attracting other objects and producing a magnetic field outside itself
magnet
What is a real life use of an electromagnet?
Electromagnetic cranes are used to lift heavy pieces of metal and move them around. Junk yards use them to lift and move cars.
the area of a magnet with the strongest force.
magnetic poles
An electromagnet must be part of an electrical ______.
circuit
Will a magnet attract copper, rubber, steel, or plastic?
steel
the space around a magnet in which magnetic forces can act on objects
magnetic field
You are testing jewelry to see if it is real gold or not. You decide to do a magnet test first. One piece attracts to the magnet but the other does not. Which piece may be real, and which one is definitely not? Explain your answer.
The one that attracts to the magnet is definitely not real gold because gold is not attracted to magnets. Only iron, cobalt, nickel, and steel are attracted to metals.
a line that connects opposite magnetic poles and represents the strength and direction of the magnetic field
magnetic field line
An electromagnet is made up of what three items.
iron bar (nail), battery, and a wire?